Grinding machine



E. J. WHALEN 1,921,714

GRINDING MACHINE' Filed Deo. 9, 1929 3 Sheets-Sheet l R O T N E V m Aug.8, 1933.

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hw N TVN vw, @N RW .VL hm. 1M e s oa w Patented Aug. 8, 1933 GRmmNGMACHINE Edward J. Whalen, Pittsburgh, Pe., assigner te Aluminum Companyof America, Pittsburgh, Pa., a Corporation of Pennsylvania ApplicationDecember 9,

4 Claims.

My invention pertains to devices for grinding circular bodies tocontours which are curved lengthwise of the body,-as, for example, ingrinding `a rollingy mill roll to a camber or 5 croWn,-and relatesespecially to grinding devices in which the support which carries'thebody being ground is given a swivelling movement during the passageofthe body past the grinding wheel, thereby to produce the desiredconvex or concave lengthwise curvature.

In grinding work of this character, extreme accuracy in the degree oflengthwise curvature imparted to the finished body is frequently anecessity, and has, in grinding devices forl this purpose as heretoforeemployed, been exceedingly difficult to obtain.. It has been common insuch prior devices to pivot the support on which the body rotates whilebeing ground, and to cause sch support to swivel about its pivotstructions have not been satisfactory because.'

of the dillulty in obtaining an accurate setting 3Q of the masterpattern and of the errors resulting from ywear and lost motion in theengaging parts. In other instances,'it has been proposed Ato obtain theswivelling of the support by special, and more o r less complicated,vmechanical movements not dependent on any master pattern; but thesecases -the number of relatively moving parts, with a correspondingcumulative error resulting from wear and lost motion, has stoodmaterially inf the way of the obtaining of the desired` accuracy. j

,1t is e major object of my invention to pro-L 'vide a grinding deviceof the character' referred to-which' is not dependent for its operationon any master pattern o'r the like and which will perform its functionswith exceptional-accuracy. A further4 object is to provide such a devicein which adjustments can befmade, for grinding the bodies to differentdegrees of lengthwise 5o curvature, `readily and withlittle liability ofA error. It is another object to provide a grinding device for thesepurposes which will be relatively simple and economical of manufacture,and which can be `applied to existing types during lengthwise movementof the body past of grinding machines without material' changes 1929.serial No. 412,653 (C1. 51-94) in the latter.v Other objects will appearfrom the following specification and claims.

vI have described, by way of example, in th following specication, andshown in the accompanying drawings, one form of grinding 60 deviceconstructed in accordance with my invention. It is to be understood,however, that the same may be embodied in other forms, and that changesmay be vmade in the form described and shown, Without exceeding thescope thereof, as defined in the appended claims:

In the drawings: y

* Fig. 1 is a plan of a grinding machine having a grinding device of myinvention applied thereto, the device being shown as adjusted forstraight grinding;

' Fig. 2 is a view similar'to Fig. 1, but showing the device as adjustedfor grinding a roll to a convex lengthwise curvature, or crown;

Fig.y 3 is an enlarged side elevation of the 75 guide stand, actuatinglever and associated parts which constitute the left hand portion ofFig. 1;

Fig 4 is a plan of the parts seen in Fig. 3, the cover for the guidebeing removed;

Fig 5 is a section, on a scale enlarged further, 80 taken'on the brokenline V--V of Fig. 4; and

Fig. 6fis asimilar enlarged section'taken `on the line VI-VI of Fig. 4.

Referring now particularly to Figs. 1 and 2, the grinding machinecomprises'a base 10 carry- 85 ing bearing supports for a grinding wheel11, drivenby a suitable motor 12. A' reciprocating table 13 isassociated with the base 10 and is caused, usually by a rack and pinionactuated from the motor 12, to travel first in one direction and then inthe other p ast the operating face of the grinding wheel 11. The machineis equipped with automatic reversing means whereby the table moves nonedirection a distance equal to the length'of the body being ground, plusthe 95 width' of the grinding wheel face, plus clearances at each end,and is then reversed to make the same movement in the oppositedirection.

Upon the reciprocating table 13 is mounted, to

swivel about a pivot 14, a swivel table 15 which 10.0

carries steady rests 16, a tail stock 17 and'a head stock '18 adapted to.be rotated by ,a motor 19. The work, shown as a roll a, is mounted inthe steady rests and held in place between the tail steek and the headstock 18,-wh1eh latter rotates 105 it during Jthe grinding operation. Ifthe swivel table 15 remains stationary upon, and in alignment with, thereciprocating table 13 4during the movements of the latter past thegrinding wheel 1,1, as indicated in Fig; 1, the work a will be no groundin a straight line. If, however, the swivel table is caused to swivelabout its pivot 14 during the longitudinal movement of the reciprocatingtable 13, the work will be ground to a lengthwise curvature,-eitherconvex or concave, depending on whether the leading end of the work ismadeto swing' away from Aor towards the grinding wheel. i

The grinding machine construction as described up to this point is wellknown in the art and does not require more than the general referencewhich has been made.4

To obtain the swivelling movement of the swivel table 15, I pivot uponthe tail end of the reciprocating table 13 an actuating lever having ashort. arm 20 whichv makes a pivoting and,

sliding connection with the end of the, swively table 15, and a long arm21 which slidably cooperates with a fixed guide 22, which latter (whenthe work is to be ground to a lengthwise curvature) is inclined withrespect to the line of movement of the reciprocating table'13, In thisway the actuating lever is made to rock about its pivot on thereciprocating table 13 as the latter moves lengthwise, such rockingmovement being communicated tothe table 15, to swivel the latter aboutits pivot 14.

' The guide 22 (Figs..3-5) is mounted on a stand 23 so as to be capableof swivelling, under adjustment, about a pivot pin 24 secured to thestand and disposed in line with the line of movement of the pivot 14 ofthe swivel table 15. The

guide 22 has extending upwardly therefrom a central longitudinal rail 25on which, and on the guide, is adapted to slide a shoe 26 equipped withinside liners 27 adapted to embrace the rail. The shoe 26 is formed withan upwardly extending tapered pin 28 upon which fits a correspondinglytapered bearing 29 formed at the rear end of. the long arm 21 of theactuating lever, nuts 30, threaded on the pin 28, being employed forretaining the actuating lever and shoe in their swivelling connection.

The actuating lever (Fig. 6) is pivotally connected with thereciprocating table* 13 by a tapered stud 31 which is carried in abracket 32 secured to the endlofthe said table, the par being retainedin position by nuts 33. 1

The short arm 20 of the actuatingI lever ha secured to its lower side arectangular split bushing 34,adapted to slidingly engage between lugs 35formed at the tail end'of the swivel table 15. The two halves of thissplitbushing are retained in position by spring seated cap screws 36which pass through holes in the arm 20 which arey sufficiently large topermit considerable movement of the cap screws therein. l Thus, whenotherwise free, the halves of the split bushing are permitted materiallateral movement withA respect tothe arm 20.

The arm`20 has threaded therein a plug 37 having a tapered end 38adapted to enter a cor-. respondingly tapered seat with which the' splitbushing Ais formed. When the plug is screwed downwardly, by means of Y aknob 39 with which it is provided, its tapered portion 38 will move thehalves of the split bushing 3 apart to cause them to engage neatlybetween the lugs 35 of the swivel table, and in this way an accuratepivotal and sliding connection, without lost motion, between the arm 20and the swivel table is obtained. The plug 37 is held in its properlyadjusted position by a lock nut 40.

The length of the arm 21 of the actuating lever and the position of thepivot 24 of the guide 22 are so,chosen that when the pivot 14 of theswivel table comes opposite the center of the grinding wheel the pin 28of thel shoe 26 will have come to such a position thatit is coaxial withthe pivot 24 of the guide 22; so that regardless of the inclination atwhich the guide 22 may be set, the swivel'table will always becentralized at the moment when its pivot 14 is opposite the center ofthe grinding wheel face.

In order that the guide 22 may be adjusted to various angles ofinclination about its pivot 24, it is formed With a plurality ofelongated slots for receiving cap screws 41 which pass through suchslots and enter lthe base 23, so that upon loosening the screws theguide can be swung about ,its pivot. The base 23 has secured vto it abracket 42 in which is mounted a pivot bearing 43 for receiving anadjusting screw 44 which is threaded into a nut 45 pivoted upon theguide 22. A graduated disc 48 on the screw 44, working against a zeromark on the bearing 43,' indicates the extent to which the inclinationof the guide has been variedvby screwing the screw 44 in or out withrespect to the nut 45. This in turn, for a given length of article beingground, will indicate the lengthwise curvature given to such article.However, the effective leverage of the device will vary with differentlengths of article being ground, and it ywill therefore generally bedesirable to substitute different graduated discs (48) for one anotherwhere articles of different lengths are handled. -v To protectthe guide22 and shoe 26 from dirt and the like, a removable cover 46 is provided110 which encloses these parts, resting, for instance, on pins 47extending from the guide 22. y AIt will be seen that the swivellingmovement of the swivel table 15 is obtained with a small number ofrelatively moving parts, so 'that the 115 chances of error resultingfrom wear and lost motion are reduced to a minimum. Furthermore, largelyin consequence of my xed guide 'and the resulting amplitude of movementof the shoe 26, the leverage exerted by the device is high, so that vtheeffect of wear or lost v motion in the shoe 26, guide 22, or pivot 242`or of' misadjustment of thescrew 44, is correspondingly reduced. Forexample, in practice a length of 68 inches for the long arm A21 of theactuating lever, and 4 inches for the short arm 20, and a distance of 55inches between the .pivot 14 of the swivel table and the center of theplug 37, has been found satisfactory. Supposing now the body to beground to be 22 inches .in length,-i. e. 11 inches on each side of thelor 85, to one; so that `the. movement of the guide 22, from its alignedposition, would have to be .085v inch. An error of one thousandth of aninch, either in adjustment or resulting from wear or lost motion betweenthe guide 22 150 any suitable `means in alignment with the re- 4ciprocating table`13.` The guide 22 is preferl0l ably set in itscentral' position (Fig. 1) in alignment with the 'reciprocating table13.

I claim: 'f

1. A device for use in grinding circular bodies to curved contours,comprising a base adapted to reciprocate in association with a grindingwheel, a work support pivotally connected with said base, a' stationaryguide member of a length not less than that oi.' the body to be ground,said member being inclined with respect to the line of movement of saidbase, and an actuating lever pivotally connected with said base andhaving one arm operatively associated with said support and the otherrarm slidingly connected with said guide member.

2. A device for use in grinding circular bodies to curved contours,comprising a base adapted to reciprocate in association with a grindingwheel, a work support pivotally connected with said base, a stationarypivot member, a guide member of a length not less than that ofthe bodyto be ground, said member being mounted for adjustment about said pivotmember to various inclinations, and an actuating leverpivotallyconnected with said base and having oneV arm operatively associated withsaid support arrf the other arm slidinglypconnected with said' lguidemember.

3. A device for use in grinding circular bodies to curved contours,comprising a base adapted to reciprocate in association with a grindingwheel, a work support pivotally, ,connected with said base, a stationarystand/disposed in line with said base, a longitudinal guide memberpivoted on said stand; said guide member being of a length not less thanthat of the body to be grounda shoe slidingly associated with saidguide, and an actuating lever pivotally connected with said base andhaving a long arm pivoted to said shoe and a short arm operativelyassociated with said work support. the parts being so constructed anddisposed that the axes of the pivots of said guide member and the longarm of said actuating lever substantially coincide -when the pivot o!said work support is opposite the grinding wheel.

4. A device foruse in'grinding circular bodies -to curved contours,comprising a base adapted to reciprocate in association with a grindingwheel, a work support pivotally connected with said base, a stationarypivot member, a guide member of a length not less than that of the bodyto be ground, said member being mounted for adjustment about said pivotmember to' various inclinations, and an actuating lever pivotallyconnected with said baseand having a relatively short arm operativelyassociated with said support and a relatively long arm slidinglyconnected with said guide member, whereby a fine adjustment of thepivoting movement of said support can be obtained by a relatively coarseadjustment of said guide member.

EDWARD J. WHALEN.

